Glass-making apparatus.



Patented 0011.27, 1908.

J. CAMPBELL.

GLASS MAKING APPARATUS.

APPLIOAT'ION FILED 00T. 25, 1901.

JAMES CAMPBELL, -OF PITTSBURGy PENNSYLVANIA.

GLASS-MAKING APFARATUS.

vSpecification of Letters Patent.

Patented Oct. 27, 1908.

Application filed October 25, 1907. Serial No. 399,143.

To all whom 'it may concern:

le it known that I, JAMES CAMPBELL, a citizen of the United States, residing at Pittsburg. in the county of .Allegheny and State of lennsylvania, have invented or dis covered new' and useful Improvements in (-lass-h/laking Apparatus, of which the f0l.

lowing is a specification. cw

My invention relates 'to apparatus for drawing glass, and its object. is to improve tank furnaces wherebyglass may be drawn therefrom without exposing the drawn glass toathe cutting action of the burners during the drawing operation and whereby the drawn glass may be readily severed by the burnersl at the close of the drawing operation.

My invention particularly relates to what I term the roof or top-stone, with which 1 combine a shield to protect the glass at the drawing Zone.

Referring tothe drawings, Figure 1 is a central vertical section of a furnace embodyingmy invention; Fig. 2, a plan thereof:

Fig. 3. a section on the line 3--3 on Fig. 2;

v and Fig. 'l'-, a detail ot the ratchet inechan? ism forsupporting the roof or top-stone.

Referring to the drawings, 1 represents a glass tank of any desired construction .hav-

ing the forehearth 2, into which the molten glass runs from the tank as the drawing of glass articles proceeds. The level of the molten glass is shown by the broken line 3.

The entire top-stone or rpof 41 of the forehearth is made to move vertically between the side walls 5 and the endy walls 6.

Supported by the walls 5 are the two shafts 7 carryingl near each end a cam 8, on which rest the lars Sl sor-.uret'l to the root'or top-stone 4.

A shaft 10 provided on the front wall 6 which is geared to the shafts 7 by the sm'ocket chains l1, the shaft 10`having the operating handle l2. The shaft 10 also carries the ratchet wheel 1.3, which may be -lockcd in any desired position by pawl 14.

16, whereby jthe roof or topstone has the depending circular flange oi: shield 17 about the lower half of the opening 16.

A number of gas burners 18 arearranged inthe walls ofthe forehearth so as to project their flames into the space between the glass line 3 and the roof or top-stone 4.

19 represents a glass cylinder being drawn from the opening 16, the mechanism for liftv'ing the ,cylinder being omitted.

The glass in the tank and forehearth being at the proper temperature for drawing, the handle 12 is rotated so asrto lower the shield 17 into the glass a suilicient distance to cut oil' the flames of the burners from the Opeliing 16 in the roof or top-stone. The cylinder 19 is then drawn through the opening 1G in the well known manner, the burners in the meantime keeping the glass around the flange in the proper condition for drawing. As soon as the drawing is completed, the handle 12 is rotated in the opposite direction, so-as to raise the shield 17 out of the glass, thus permitting the flames, from .the

burners to rut oti' thecylinder vat the glass line. This position of the shield and related parts is shown in dotted lines on Fig. 3. The cylinder 19 is then removed from the furnace and the opening 16 covered and the burners allowed to remelt the glass cut off from the cylinder and the glass adhering .to the walls of the opening 16. By reason of `the flare in the bottom of the opening the heat will be enabled. to attack the 'glass in the opening better than if the walls of the opening were vertical. When the glass ready for another drawing, the roof or topstone is again lowered and the operation described is repeated.

By making the whole top of the forehearth movable vertically, I preserve an absolutely perfect seal against the flame attar-king; the cylinder' above the top-stone. Furthermore in case repairs are needed'in the forel'iearth, it is but the matter of a few minutes to attach a hoisting mechanism to the roof or top-stone and take it entirely out of the way.r thus giving full access to the interior of the furnace. Incase the llames shall emerge at `the edges of. the roof or top-stone, no damage will be done to the cylindtr as the distance therefrom is too great. l

' By the use 01 the word top-stone, I do not confine myself to the use of stone or any and lower the roof so that the flange may 'Y october, A.-D. 1907.

project into the glass during the drawing operation and be raised out of the glass after the same, and burners arranged to project their flames into the space between the top-stone and the glass line.

2, In a glass drawing furnace, a glass melting tank, a orehearth connected thereto, a vertically movable roof for the latter,

having al drawing opening therein, a shield projecting from the bottom of the roof, having movement with the said roof, and forming the lower partV of said opening, means to raise and lower said roof, and burners .arranged to project their flames into the space .between the roof and the glass line.

Signed at. Pittsburg, Pa., this 18th Clay of JAMES CAMPBELL.

Witnesses:

F. N. BARBER, ANNA R.' BEATTY. 

